This new model of steel doors boasts an STC58 (sound transmission class), which exceeds the STC53 commonly found in similar doors from other manufacturers. The doors are 1.75" thick, so standard latching hardware can be used. The door sits on three cam hinges and uses invisible gaskets to hide the seals when closed. Gaskets can be replaced in the field if needed. The one-piece frame can be sized to a standard door opening or any custom size. Glass can be added to a door, and STC data for doors with glass is being gathered.